Electrical cable

Abstract

An electrical cable of conductive wire having an insulating layer of microporous polymeric material around it, followed by a coating of a polyesterpolyurethane surrounding the insulating layer, and an outer film of polyetherpolyurethane surrounding the coating.

We claim: 
     
       1. An electrical cable comprising: (a) at least one conductive wire   (b) an insulating layer surrounding the conductive wire, said insulating layer comprising a microporous polymeric material,   (c) a coating of an organic solvent soluble polyurethane surrounding the insulating layer,   (d) a film covering and surrounding the coating comprising a film of extruded polyurethane.   
     
     
       2. The cable of claim 1 wherein the polyurethane coating is formed from a solution of a polyesterpolyurethane in an organic solvent. 
     
     
       3. The cable of claim 1 wherein the extruded polyurethane film is a polyetherpolyurethane. 
     
     
       4. An electrical cable comprising a series of side-by-side parallel conductive wires arranged in a coplaner configuration to form a flat construction; said wires covered and surrounded by an insulative layer of expanded, microporous polytetrafluoroethylene, said insulative layer containing an outer covering of a polyesterpolyurethane; said cable having a layer of polyetherpolyurethylene laminated to each side of said flat construction, so as to form a solid protective film coating surrounding the assembly within. 
     
     
       5. A process for making the cable of claim 1 which comprises: (a) applying microporous polymeric material around a conductive wire to form an insulative coating,   (b) subjecting the coated wire to a solution of an organic solvent soluble polyurethane and drying the resulting assembly,   (c) laminating film of an extruded polyurethane around said resulting assembly in a manner that encapsulates said assembly.